AOVS

Automatic Opening Vents 

What is an aov?

Automatic Opening Vents, often known as AOVs, are systems designed to open windows, roof hatches, or louvres during a fire to release smoke and heat. As a result, they help keep escape routes clear for occupants and firefighters, improve visibility, and support safe evacuation.   

AOVs activate through smoke detectors or the building’s fire alarm system. They play an important role in controlling the movement of smoke and heat during a fire. In particular, they form a key part of a building’s fire strategy in areas such as corridors, stairwells, and large open spaces, where smoke build up can pose a serious risk.

How AOVS OPERATE

The system follows a smooth automatic sequence. When smoke is detected, the system sends a signal to the AOV control panel. The panel then activates the relevant vent by sending an electrical signal to the actuator, which causes the vent to open.

As the vent opens, heat and smoke naturally rise and exit the building. At the same time, cooler air enters at lower levels. This process reduces smoke build up in occupied areas and supports effective smoke control during a fire.

UK Standards and Compliance

AOV systems must be designed, installed, and maintained in line with UK fire safety regulations.

Building Regulations Approved Document B provides guidance on smoke ventilation requirements within buildings, including the use of AOVs to protect escape routes such as stairwells and corridors.

Where AOVS are used 

AOVs are commonly installed in areas where smoke could build up quickly and affect safe evacuation.


Typical locations include stairwells, corridors, and lobbies that form part of escape routes. In addition, designers often use AOVs in atriums and large open spaces, where smoke needs to vent at high level. They also support smoke ventilation in other enclosed areas where natural airflow is required.

Further guidance is provided by British Standards including BS 9991 for residential buildings and BS 9999 for non-residential buildings, which outline best practice for fire safety and smoke control systems.

Referencing these standards helps ensure AOV systems are compliant and form part of an effective life safety strategy without compromising building design.

What We Offer

Regular testing and maintenance are essential. Routine checks confirm that the system responds correctly to smoke detection and that control panels, actuators, vents, and manual controls work as intended. These checks also help identify faults early. Maintaining all components in good working order ensures smoke ventilation performs as designed.

It is also important to keep records of all inspections, testing, and maintenance. These support ongoing compliance with UK fire safety requirements and form part of the building’s fire safety documentation.

At AWB and Son, we provide professional inspection, testing, and maintenance services for AOV systems in line with current UK guidance. Our engineers carry out scheduled servicing, functional testing, and system checks. They identify any issues and give clear recommendations for remedial action. With detailed reporting and ongoing support, we ensure your smoke ventilation systems remain safe, compliant, and reliable when needed most.

By choosing AWB, you invest in dependable fire protection that meets the highest industry standards, safeguarding lives and property with precision and care .

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